Table 2.

Serum IgM levels after PerC and bone marrow transfer into irradiated hosts

Host*	n	Donor BM	Donor PerC	Serum IgMa†, μg/ml ± SE	Serum IgMb†, μg/ml ± SE	IgMa + IgMb‡, μg/ml
μ−/−	7	μ−/−	C57/Igha	340  ± 170	< 0.015	340
μ−/−	7	C57	C57/Igha	600  ± 140	510  ± 98	1,100
RAG1−/−	5	C57	C57/Igha	370  ± 68	710  ± 44	1,100
C57	4	μ−/−	C57/Igha	1,100  ± 91	160  ± 7.0	1,200
C57	10	C57	C57/Igha	570  ± 23	240  ± 24	820

^*Lethally irradiated recipients before transfer of 5 × 10⁶ PerC and 3 × 10⁶ bone marrow cells (BM) from donors indicated in Table. Sera were taken from mice 2–3 months after transfer and analyzed by ELISA. 

^†Data shown are mean titers ± standard error. 

^‡Mean total IgM levels were calculated by adding the values obtained by ELISA for IgM^a and IgM^b.